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ISSN:2528-9527 E-ISSN : 2528-9535
Yıl Year : 9 Cilt Volume:12
Sayı Issue :18. UİK Özel Sayısı Ağustos August 2019
Makalenin Geliş Tarihi Received Date: 16/07/2019 Makalenin Kabul Tarihi Accepted Date: 00/00/2019
OPUS © Uluslararası Toplum Araştırmaları Dergisi-International Journal of Society Researches
ISSN:2528-9527 E-ISSN : 2528-9535 http://opusjournal.net
The Validity and Reliability of Propensity to Trust Scale
DOI: 10.26466/opus.592428
* İlksun Didem Ülbeği* - Azmi Yalçın**
* Dr., Çukurova Üniversitesi, İktisadi ve İdari Bilimler Fakültesi, İşletme Bölümü / Adana / Türkiye
E-Posta: [email protected] ORCID: 0000-0001-6905-2720
** Prof. Dr., Çukurova Üniversitesi, İ.İ.B.F, İşletme Bölümü / Adana /Türkiye
E-Posta: [email protected] ORCID: 0000-0002-9323-3350
Abstract
In this study, it is aimed to assess the validity and reliability of propensity to trust scale developed by
Frazier, Johnson, & Fainshmidt (2013) by adapting to Turkish. In this regard, explanatory factor anal-
ysis, confirmatory factor analysis, item analysis, internal consistency coefficients, and validity analyses
are conducted with the data obtained from two different samples comprised of students (n = 287) and
employees (n = 323) in Turkey. According to this, explanatory factor analysis results showed single
factor consrtuct of the scale. Moreover, confirmatory factor analysis findings also revelaed single factor
construct of this scale (χ/sd = 1.345; p = .261; CFI = .999; TLI = .998; IFI = .999; RMSEA = .033;
SRMR= .008). Reliability analyses results showed Alpha and Omega coefficients indicate that the scale
is reliable. Regarding the validity of the scale discriminant validity, convergent validity, and criterion
related validity related assessments revealed the validity of the scale. The results of explanatory factor
analysis, confirmatory factor analysis, validity, and reliability analyses findings revealed that Turkish
version of propensity to trust scale is a valid and reliable instrument to use in studies in Turkey.
Keywords:
Propensity to Trust, Validity, Reliability, Exploratory Factor Analysis, Confirma-
tory Factor Analysis
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ISSN:2528-9527 E-ISSN : 2528-9535
Yıl Year : 9 Cilt Volume:12
Sayı Issue :18. UİK Özel Sayısı Ağustos August 2019
Makalenin Geliş Tarihi Received Date: 16/07/2019 Makalenin Kabul Tarihi Accepted Date: 00/00/2019
OPUS © Uluslararası Toplum Araştırmaları Dergisi-International Journal of Society Researches
ISSN:2528-9527 E-ISSN : 2528-9535 http://opusjournal.net
Güven Eğilimi Ölçeğinin Geçerlik ve Güvenirlik
Analizi *
Öz
Bu çalışmada, Frazier, Johnson, & Fainshmidt (2013) tarafından geliştirilmiş olan güven eğilimi
ölçeğinin Türkçe’ye uyarlanarak geçerlik ve güvenirliğinin incelenmesi amaçlanmaktadır. Bu doğrul-
tuda Türkiye’de öğrenciler (n = 287) ve çalışanlardan (n = 323) oluşan iki farklı örneklemden elde edilen
veri ile açıklayıcı faktör analizi, doğrulayıcı faktör analizi, iç tutarlılık katsayıları ve geçerlik analizleri
gerçekleştirilmiştir. Buna göre yapılan açıklayıcı faktör analizi sonuçları ölçeğin tek faktörlü bir yapısı
olduğunu göstermiştir. Ayrıca gerçekleştirilmiş olan doğrulayıcı faktör analizi bulguları da ölçeğin tek
faktörlü bir yapısı olduğunu ortaya koymuştur (χ2/sd = 1.345; p = .261; CFI = .999; TLI = .998; IFI =
.999; RMSEA = .033; SRMR= .008). Güvenirlik analizleri bulguları ise alfa ve omega katsayılarının
ölçeğin güvenilir olduğuna işaret ettiğini belirlemiştir. Ölçeğin geçerliğine yönelik olarak
gerçekleştirilen ayrışma geçerliği, birleşme geçerliği ve ölçüt bağımlı geçerliğe yönelik değerlendirmeler
ise ölçeğin geçerliğini ortaya koymuştur. Yapılan açıklayıcı ve doğrulayıcı faktör analizleri ile geçerlilik
ve güvenirlik analizlerinin sonucunda elde edilen bulgular güven eğilimi ölçeğinin geçerli ve güvenilir
olarak değerlendirilebileceğini ortaya koymakta olup Türkiye’de yapılacak olan araştırmalarda kullanıla-
bileceğini göstermektedir.
Anahtar Kelimeler:
Güven Eğilimi, Geçerlik, Güvenirlik, Açıklayıcı Faktör Analizi,
Doğrulayıcı Faktör Analizi
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Introduction
Trust is a vital element in individuals’ both personal and work lives. Trust
has a growing importance in today’s business setting in particular with
high competition in global environment, advanced technologies in pro-
duction, information, and communication, changes of organization struc-
tures, different work practices, and various generational approaches to
employment (Bachmann and Zaheer, 2006; Frazier, Johnson, and
Fainshmidt, 2013).
In recent years especially as a consequence of the gaining importance
in organizational life, trust has been studied extensively (Mayer and Da-
vis, 1999). Trust is a fundamental element of employer-employee relation-
ship and is an important factor for effective relations (Colquitt, Scott, and
LePine, 2007, p.918). Research on trust reveals that trust has several out-
comes in organizational functioning; it leads to increased job satisfaction,
advanced job performance, increased organizational commitment, and
raised organizational citizenship behaviors (Frazier et. al., 2013). In con-
nection with its significance to various behaviors and attitudes, under-
standing the dispositional factors for development of trust becomes note-
worthy.
Propensity to trust is an individual’s disposition to trust (Gill, Boies,
Finegan, and McNally, 2005, p. 287). According to Whitener, Brodt,
Korsgaard and Werner (1998) this disposition is based on the expectation
about the individuals’ trustworthy actions. Propensity to trust levels can
differ according to personality, culture, and experiences (Mayer, Davis
and Schoorman, 1995). Moreover, individuals with high level or propen-
sity to trust will also have high level of trust for other individuals (Whit-
ener et. al., 1998).
Propensity to trust has various outcomes concerning both individual
and work such as well-being, social exchange, organizational commit-
ment, organizational citizenship behavior, job satisfaction, organizational
support, and most likely trust itself (Bernerth and Walker, 2009; Nambu-
diri, 2012; Poon, Mohd Salleh and Senik, 2007; Van Dyne, Vandewalle,
Kostova, Latham, and Cummings, 2000). Even though propensity to trust
has significant effects on various attitudes and behaviors, and is an im-
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portant antecedent of trust, it has not received much attention in the liter-
ature. In consequence of an unaddressed concept, it has not attracted
much attention among scholars, and as a result, a brief, valid, and reliable
instrument is unavailable in the literature to measure the construct.
In this regard, understanding the development and formation of trust
is essential. In this context, our aim is to reveal the validity and reliability
of propensity to trust scale in two Turkish samples in order to make avail-
able in Turkish context. Accordingly, we examine the factorial structure
and reliability of the scale in the first step. Next, we confirm this structure
by conducting confirmatory factor analysis in a second sample. Moreover,
we check validity of the scale by examining convergent validity, discrimi-
nant validity, and criterion validity. In addition, we assess the reliability
of the scale in the second sample as well. Thereby we expect to make a
contribution to the literature by providing this scale regarding propensity
to trust. Regard to this, with this study by validating the propensity to
trust scale, we expect to be useful for the researchers who would like to
study further and make a contribution to the field and understanding of
trust and formation of trust in organizational life.
Background
Trust is conceptualized with various definitions due to the different ap-
proaches (Colquitt et. al., 2007), this leads to confusion about the construct,
antecedents, and outcomes of trust (Gill et. al., 2015). With their frame-
work Mayer et. al. (1995) shed light on the development of interpersonal
trust.
According to this integrative and extensive model of trust, two parties’
characteristics are taken into consideration, trustor and trustee. The model
suggests that trust is formed by trustor’s perception of the trustee and
trustor propensity to trust (Ashleigh, Higgs and Dulewicz, 2012), trustor
propensity to trust and trustee’s perceived trustworthiness are the ante-
cedents to trust. In this framework, high levels of propensity to trust and
perceived trustworthiness lead to trust which is the willingness to be vul-
nerable to the actions of the trustee whereas as a result the trustor takes
more risks in this relationship (Mayer et. al., 1995) (see Figure 1).
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Several characteristics of the trustee are identified in the literature (e.g.,
Butler, 1991; Cook and Wall, 1980; Ring and Van de Ven, 1992; Sitkin and
Roth, 1993; Mishra, 1996), however the proposed model attributes of the
trustee are mostly explanatory (Mayer et. al, 1995; Heyns and Rothmann,
2015). The model suggests that perceived trustworthiness of the trustee is
examined in three factors, ability, benevolence, and integrity (Mayer et.
al., 1995).
Ability is that group of skills, competencies, and characteristics that en-
able a party to have influence within some specific domain (Mayer et al.,
1995, p.717) whereas in trust literature competence and expertise are also
used interchangeably (Mayer et. al., 1995). Benevolence is the extent to
which a trustee is believed to want to do good to the trustor, aside from
an egocentric profit motive (Mayer et. al., 1995, p. 718). And lastly integrity
is the trustor’s perception that the trustee adheres to a set of principles that
the trustor finds acceptable (Mayer et. al., 1995, p. 719). In previous studies
instead of integrity, value congruence and character were used as syno-
nyms (Mayer et. al., 1995).
Figure 1. Integrative Model of Trust (Mayer, Davis, & Schoorman, 1995, p. 715)
Trust is conceptualized as a trait by several researchers in the literature
(e.g. Rotter, 1967; Mayer et. al., 1995). Rotter (1971) addressed trust as a
generalized expectancy about others trustworthy behavior and this can be
Ability
Benevolence
Integrity
Trust
Trustor’s
Propensity
Risk Taking in
Relationship Outcomes
Perceived Risk
Factors of Perceived
Trustworthiness
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assessed as a permanent personality attribute which does not change de-
pendent on time or place. According to Rotter (1980) individuals with high
propensity to trust are also trustworthy people.
Propensity to trust is the dispositional factor that establishes the indi-
vidual to trust or not (Van Dyne et. al., 2000). This tendency is more salient
in situations when the trustee is not closely known, on the other hand it
also serves as a cognitive leap even in the situation where the information
is available about the trustee (Colquitt et. al., 2007). Lewis and Weigert
(1985) stated that trustworthiness is only the beginning for trust, however
without trust propensity, trust will not be established.
Trust literature shows that propensity to trust of individuals has sig-
nificant outcomes in their attitudes and behaviors. For example, Van Dyne
et. al. (2000) revealed in their study that propensity to trust has a positive
relationship with organizational citizenship behavior. According to this if
a person has trusting dispositions than this individual will also behave in
positive behaviors and less negative behaviors (Van Dyne et. al., 2000, p.
6). In their meta-analysis, Colquitt et. al (2007) also found that trust pro-
pensity has a positive correlation with organizational citizenship behav-
iors.
In their meta-analysis Dirks and Ferrin (2002) showed that propensity
to trust is related to trust in leadership. Colquitt et. al (2007) conducted a
meta-analysis study on trust, trustworthiness, and trust propensity and
revealed that trust propensity is positively related to trust and risk taking.
Colquitt et. al (2007) also found that trust propensity is positively related
with ability, benevolence, and integrity whereas they showed that it is
negatively correlated with counterproductive work behaviors.
Poon et. al. (2007) revealed that there are positive and significant rela-
tionships between propensity to trust with job satisfaction and perceived
organizational support. They also showed that propensity to trust moder-
ates the relationship between organizational support perceptions of em-
ployees and their job satisfaction levels.
Bernerth and Walker (2009) found that employees’ propensity to trust
has a significant and positive effect on employees’ perceptions of social
exchange. They also asserted that in the presence of more trusting manag-
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ers and employees, employees’ perceptions of positive relationships in-
crease whereas the situation is reverse, the employees perceive social ex-
change less positively.
Mahony, Klimchak and Morrell (2012) showed in their study that pro-
pensity to trust has a positive and significant effect on employees’ job per-
formance. Colquitt et. al (2007) revealed in their meta-analysis study that
there is a positive and significant correlation between trust propensity and
task performance.
Nambudiri (2012) found that propensity to trust has positive relation-
ships with affective commitment, and normative commitment whereas
the relationship with continuance commitment was significant at .05 level.
Moreover, Colquitt et. al. (2007) showed a positive correlation between
trust propensity and affective commitment in their meta-analysis study.
Method
In this research, we conducted two studies in two different samples. In the
first study, we assessed the factorial structure and reliability of the scale.
In the second study we conducted a confirmatory factor analysis, exam-
ined the validity and reliability of the scale further.
Samples
First sample was comprised of university students. We distributed 300
questionnaires and 290 of them were returned however, 287 of them were
useful for data analysis. There were 149 females and 138 males in the sam-
ple. The mean age was 21.85 years.
Second sample comprised of employees working in private sector in
Adana. 330 questionnaires were distributed in total, and 323 of them were
returned with full data. There were 172 females and 151 males in the sam-
ple. The mean age was 40.56 years and the mean job tenure was 17.02
years. The participants’ education level was mostly undergraduate level
(%89).
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Data Collection Tools
In order to assess the validity and reliability of the propensity to trust scale
in Turkish samples we used the similar variables in the original study
which are propensity to trust, ability, benevolence, integrity, and trust.
Propensity to trust is assessed using with the scale developed by Fra-
zier, Johnson and Fainshmidt (2013). This measure has a one-factor struc-
ture and consists of four items. In their study Frazier et. al. (2013) reported
internal consistency coefficients of .89 and .88.
In order to measure ability, benevolence and integrity we used the
items developed and shortened by Mayer and Davis (1999). We examined
ability by using six items. In their study, Mayer and Davis (1999) reported
Alphas as .85 and .88 in various samples. Benevolence is measured using
five items and they reported Alphas .87 and .89 in their study. In addition,
we examined integrity by using six items. Mayer and Davis (1999) found
Alphas as .82 and .88 in their study.
Trust is examined using the scales developed by Schoorman, Mayer
and Davis (1996) and taken from the study conducted by Mayer and Davis
(1999). In their study internal consistency coefficient are reported as .59
and .66.
In this study 5-point Likert scale is used ranging from “1 = strongly
disagree to 5 = strongly agree” as response categories.
Statistical Analyses
The statistical analyses are conducted using R Studio version .0.99.903
based on R Version 3.3.1 (R Core Team, 2016). We utilized several R core
packages with psych (Revelle, 2017), Qgraph (Epskamp, Cramer, Wal-
dorp, Schmittmann, and Borsboom, 2012), SemPlot (Epskamp with Stu-
ber, 2017), and Lavaan (Rosseel, 2012).
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Results
Study 1
1. Explanatory Factor Analysis
In order to assess the construct validity of the scale, we utilized explana-
tory factor analysis. This is a widely used method to show construct va-
lidity of a scale with a different purpose or sample (Çokluk, Şekercioğlu,
& Büyüköztürk, 2012, p. 177). We used principle components analysis
method for extraction and varimax method for rotation; however, the
analysis could not rotate the solution as only one component was ex-
tracted. Results showed that KMO (Kaiser-Meyer-Olkin) Measure of Sam-
pling Adequacy was .833 and Bartlett’s Test of Sphericity was χ2 = 562.280;
df = 6; p .0001. Explanatory factor analysis results revealed one factor
structure of the scale as it was in the original one. As seen on Table 1 factor
loadings were .858, .857, .871, and .823, and the 72.63% of total variance
was explained by this factor.
Table 1. Factor Loadings of the Propensity to Trust Scale
Propensity to Trust Factor Loadings
PT1 .858
PT2 .857
PT3 .871
PT4 .823
Explained Variance: % 72.628
KMO: .833
Bartlett's Test of Sphericity: χ² = 562.280; df = 6; p < .0001
Principle Component Analysis
Reliability Analysis
In order to assess the reliability of the scale, we utilized both item analysis
and internal consistency coefficients. As seen in Table 2, corrected item-
total correlations were between .688 and .758 and deleting any items from
the scale did not increase Cronbach’s alpha coefficient.
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For assessing internal consistency of the scale, we used both
Cronbach’s alpha and McDonald’s omega coefficients. According to the
results, alpha coefficient was .874 whereas omega coefficient was .875.
Table 2. Reliability Analysis of the Propensity to Trust Scale
Propensity to Trust
Scale Items
Corrected
Item-Total
Correlation
Alpha If Item Deleted Mean Standard
Deviation
PT1 .738 .836 4.199 .844
PT2 .737 .836 4.303 .795
PT3 .758 .827 4.331 .809
PT4 .688 .855 4.441 .751
Study 2
1. Confirmatory Factor Analysis
In order to confirm the results of explanatory factor analysis, we con-
ducted confirmatory factor analysis using maximum likelihood method.
As seen in Table 3 confirmatory factor analysis results showed a very good
model fit, χ2 = 2.690; df = 2; p < .261. Furthermore, model fit indices are
obtained as CFI = .999; TLI = .998; IFI = .999; RMSEA = .033; and SRMR =
.008. As shown in Figure 2, standardized regression weights were .832;
.854; .850; and .855.
Table 3. Confirmatory Factor Analysis Model Fit Results
Fit Index Model Results Reference Values1
χ² (CMIN) 2.690 0 ≤ χ² ≤ 2df
df 2 -
χ²/df (CMIN/df) 1.345 0 ≤ χ²/df ≤ 2
p value .261 -
CFI .999 .90 < CFI
TLI .998 .90 < TLI
IFI .999 .90 ≤ IFI ≤ .95
RMSEA .033 .00 ≤ RMSEA ≤ .05
SRMR .008 .00 ≤ SRMR ≤ .05
χ²=Chi-Square, df=Degrees of Freedom, RMSEA= Root Mean Square
Error of Approximation, IFI= Incremental Fit Index, TLI = Tucker Lewis
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Index, CFI = Comparative Fit Index, SRMR = Standardized Root Mean
Square Residual, 1Referance values adapted from Bayram, 2010; Meydan
& Şeşen, 2011, Hair, Black, Babin, & Anderson, 2014.
Figure 2. Propensity to Trust Scale Confirmatory Factor Analysis Results
Validity Results
In order to assess construct validity, we examined convergent validity,
discriminant validity, and criterion validity. For establishing convergent
validity, factor loadings and average variance extracted (AVE) values
should be higher than .50 and composite reliability (CR) coefficients
should be higher than .70 (Hair et. al., 2014, p. 605). According to our anal-
ysis results, as seen in Figure 2 factor loadings are between .832 and .855
that are higher than .50. Moreover, as shown in Table 4, AVE values are
higher than .50 whereas CR coefficients are higher than .70. All these re-
sults revel that convergent validity is ensured for the scale.
In order to establish discriminant validity, AVE values should be
higher than MSV values and the square root of AVE values should be
higher than the correlations between the variables (Hair et. al., 2014, p.
631). According to our analysis results, as seen on Table 4, AVE values are
above .50 and square root of AVEs which are shown in diagonals are also
higher than the correlations between the variables. These findings show
that discriminant validity is ensured for this scale.
For the purpose of establishing criterion validity, the relationships be-
tween the variables should fulfil the expectations (Hair et. al., 2014, p. 633).
According to our findings, as seen in Table 4, the correlations of propen-
sity to trust with ability, benevolence, integrity, and trust are positive as
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expected regarding the theoretical background. These results revealed
that criterion validity is also established for the scale. Table 4. Means, Standard Deviations, Cronbach’s Alphas, McDonald’s Omegas, Com-
posite Reliabilities, AVEs, MSVs and Correlations of the Scales
Variables Items Mean SD α CR-ω AVE MSV 1 2 3 4 5
Propensity
to Trust 4 3.892 .824 .910 .911 .718 .230 .848
Ability 6 3.795 .792 .922 .922 .662 .320 .480** .814
Benevo-
lence 5 3.868 .829 .914 .914 .680 .304 .468** .516** .825
Integrity 6 3.812 .923 .928 .928 .684 .320 .430** .566** .551** .827
Trust 4 3.883 .889 .890 .891 .671 .246 .439** .479** .481** .496** .819
α=Cronbach’s Alpha Coefficient, CR- ω =Composite Reliability, McDon-
ald’s Omega Coefficient, AVE=Average Variance Extracted, MSV=Maxi-
mum Shared Variance, SD=Standard Deviation, *Diagonal values are the
square root of AVEs, n = 323, **p<.01.
Reliability Analysis
For the second sample, item analysis revealed that corrected item-correla-
tions are between .784 and .803 (see Table 5). Furthermore, the results
showed that deleting items from the scale do not rise the Cronbach’s alpha
coefficient. In addition to item analysis, internal consistency of the scale
was also assessed using Cronbach’s alpha (Cronbach, 1951) and McDon-
ald’s omega (McDonald, 1999) coefficients. As seen in Table 4 Cronbach’s
alpha was .910 whereas McDonald’s omega was .911. These results re-
vealed that reliability of the scale is established with these analyses.
Table 5. Reliability Analysis of the Propensity to Trust Scale
Propensity
to Trust Scale
Corrected
Item-Total
Correlation
Alpha If
Item Deleted Mean
Standard
Deviation
PT1 .784 .889 3.749 .966
PT2 .800 .882 3.833 .944
PT3 .800 .879 3.932 .917
PT4 .803 .856 4.056 .883
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Discussion
In this study, the aim was to investigate the validity and reliability of the
propensity to trust scale (Frazier et. al., 2013) in two samples in Turkey. In
first study, we conducted explanatory factor analysis to reveal the factor
structure of the scale and the results showed one factor structure as in the
original scale. According to these results factor loadings were above .80
and statistically significant. These research findings are consistent with
earlier studies in several contexts (e.g.Frazier et. al., 2013).
We also examined the reliability of this scale using both item analysis
and reliability coefficients Cronbach’s alpha and McDonald’s omega in
the first sample. Both coefficients were above .70 and their values were
.874 and .875. respectively. Moreover, corrected item-total correlations re-
sulted between .688 and .758, which are above the cutoff value .30 (Nun-
nally & Bernstein, 1994, p. 305; Robinson, Shaver, & Wrightson., 1991, p.
31).
In the second study we conducted confirmatory factor analysis, estab-
lished the validity with convergent validity, discriminant validity, crite-
rion validity and reliability of the scale with item analysis and reliability
coefficients. Confirmatory factor analysis results showed excellent fit and
above .80 standardized regression coefficients that are statistically signifi-
cant, and confirmed one factor solution concurrent with explanatory fac-
tor analysis. The findings regarding convergent validity, discriminant va-
lidity, and criterion validity ensured the validity of the scale. We further
examined the reliability of the scale in the second sample. The item analy-
sis revealed values between .784 and .803 that are above .30 and reliability
coefficients resulted .910 and .911 that are above .70 in this sample as well.
These results showed satisfactory values that are compatible with the orig-
inal study (e.g.Frazier et. al., 2013).
This study is not without limitations. Even though we utilized two dif-
ferent samples, the participants were comprised of only students and pri-
vate sector employees from Adana. In future studies, the researchers can
conduct studies with samples from different cities in Turkey with employ-
ees from different occupations.
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This study revealed that propensity to trust scale is one factor instru-
ment with very good reliability results. Moreover, the study showed that
the validity of this scale is also established. These findings suggest that
propensity to trust is a valid and reliable instrument for utilizing studies
in Turkey.
Kaynakça / References
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trust scale and its relationship with individual well-being: impli-
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Bachmann, R. and Zaheer, A. (2006). Introduction. In (R. Bachmann and
A. Zaheer Eds.) Handbook of Trust Research (p. 1- 12). Northampton,
MA: Edward Elgar Publishing.
Bayram, N. (2010). Yapısal eşitlik modellemesine giriş [Introduction to struc-
tural equation modeling]. İstanbul: Ezgi Kitabevi.
Bernerth, J. B. and Walker, H. J. (2008). Propensity to trust and the impact
on social exchange. Journal of Leadership & Organizational Studies,
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Butler, J. K. (1991). Toward understanding and measuring conditions of
trust: Evolution of a conditions of trust inventory. Journal of Man-
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Çokluk, Ö., Şekercioğlu, G., and Büyüköztürk, Ş. (2012). Sosyal bilimler için
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kara: Pegem Akademi.
Colquitt, J. A., Scott, B. A. and LePine, J. A. (2007). Trust, trustworthiness,
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Kaynakça Bilgisi / Citation Information
Ülbeği, İ. D. ve Yalçın, A. (2019). The validity and reliability of propensity
to trust scale. OPUS–Uluslararası Toplum Araştırmaları Dergisi,
12(18. UİK Özel Sayısı), 850-866. DOI: 10.26466/opus.592428